I think that GUI interface wallet should be released ASAP.
Poloniex and Bittrex adding Ether to their exchanges made it easily accessibly for many people and most of those people are not skilled enough to transfer the coins to the cold wallet or to HDD. This encourages people to hold huge number of ETH on exchanges and we all know Mt.Gox story. Just imagine what would happen if owners of those exchanges just disappeared with this whole Ether. Please make releasing wallet your priority.